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// chapter 2 , Example2 2 , pg 53
T=250+273 //temperature(in kelvin) (converting celsius into kelvin)
h=6.625*10^-34//plancks constant(in Js)
c=3*10^8//speed of light(in m/s)
lam=590*10^-9//wavelength(in m)
k=1.38*10^-23//boltzman constant (in (m^2*Kg)/(s^2*k))
N=1/(exp((h*c)/(lam*k*T))-1) //N=((n21)'/(n21)) ratio of stimulated emission to spontaneous emission
printf("Ratio of stimulated emission to spontaneous emission is")
disp(N)
//answer given is wrong
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